On my system (HP 6710b) when idling, powertop says:

Wakeups-from-idle per second : 589,6    interval: 10,0s
no ACPI power usage estimate available

Top causes for wakeups:
  63,0% (421,7)       <interrupt> : PS/2 keyboard/mouse/touchpad 
  12,4% ( 83,1)       <interrupt> : yenta, HDA Intel, [EMAIL 
PROTECTED]:0000:00:02.0 
   9,0% ( 60,4)      <kernel IPI> : Rescheduling interrupts 
   6,2% ( 41,2)       <interrupt> : extra timer interrupt 
   1,6% ( 11,0)       <interrupt> : libata 
   1,6% ( 10,6)       <interrupt> : iwl3945 

sucks

-- 
ps2 synaptics touchpad causing huge amounts of wakeups
https://bugs.launchpad.net/bugs/194489
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